Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4c5f1fabe5dc38…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 04:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95d142395b3c6cb4eac943bc4e98cecb SHA-1: 0d004b73a51fccad3959f5f644af3ad87bcf4ea3 SHA-256: 5d4c5f1fabe5dc38808cda7db6a4fcc5c4644eae77e4697bb82482daff0af967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jandenzobv.com/image_uploads/file/10840878258.pdf In PDF document text
    • https://zohopin.com/calisma2/files/uploads/33919081639.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/tozegaxisitafoxasajosi.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/15703985376.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaf2e511c8---fixagosoxofani.pdfIn PDF document text
    • https://ntc-container.com/upload/files/62485536660.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125cb4e324cb---41946853090.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ctuk4sbf2e1c429fcekt1cq9g3/golexozururiwunusakodofux.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e2e031c---32089206602.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jugasofewadi.pdfIn PDF document text
    • https://x-software.cz/data/file/vomiwoxokalixepog.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/sefuwuwepukoro.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/gufixirasub.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/23769612104.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbce2b41147---xipegoz.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/17288615902.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/vinuraruga.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/midezipixike.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/tumizalazaximev.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1193d3ae---mimominefuravu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/36cb88882826bc2da7fa2edbef265d8b/10932430169.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/tadonafasodoxamexufen.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16124b6f89d41d---52220216719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+network+operating+systemPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 19396 bytes
SHA-256: 8209964a9d92e8bfdf32a98be68b3c877075c2749df5fa1a31350cb04c40597b
font_01_sfnt_off00010f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F88 10908 bytes
SHA-256: d5fa165c4fd8e63cf21b4877db05d687889ed47623605c818b8957d8ff4b2aa4
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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